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When you logoff from the desktop, your computer will have a lock screen with a background image. You can change this image and set one from local hard drive, as you wish.
The lock screen looks like this. We will change this background.

1 Open Charms
Press Windows + C keys, to open the Charms menu.

2 Settings
Then click on Settings (bottom-right corner).
3 Change PC Settings
Click on this option.

4 Lock Screen
Click on the big image with your current background image for the lock screen.

5 Choose a new image
Select another image.

If you click Browse, you can select an image from local hard drive.

Also, you can play a slideshow and the pictures will rotate on your lock screen.

6 View the result
Press Windows + L to logoff.

The new background is in its place.
